mirror of https://github.com/status-im/consul.git
284 lines
8.4 KiB
Go
284 lines
8.4 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: BUSL-1.1
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package structs
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import (
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"bytes"
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_ "embed"
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"fmt"
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"hash"
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"hash/fnv"
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"html/template"
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"github.com/hashicorp/consul/acl"
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"github.com/hashicorp/consul/api"
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"github.com/hashicorp/consul/lib/stringslice"
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"github.com/hashicorp/go-multierror"
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"github.com/xeipuuv/gojsonschema"
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"golang.org/x/exp/slices"
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)
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//go:embed acltemplatedpolicy/schemas/node.json
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var ACLTemplatedPolicyNodeSchema string
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//go:embed acltemplatedpolicy/schemas/service.json
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var ACLTemplatedPolicyServiceSchema string
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type ACLTemplatedPolicies []*ACLTemplatedPolicy
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const (
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ACLTemplatedPolicyServiceID = "00000000-0000-0000-0000-000000000003"
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ACLTemplatedPolicyNodeID = "00000000-0000-0000-0000-000000000004"
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ACLTemplatedPolicyDNSID = "00000000-0000-0000-0000-000000000005"
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ACLTemplatedPolicyNomadServerID = "00000000-0000-0000-0000-000000000006"
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ACLTemplatedPolicyNoRequiredVariablesSchema = "" // catch-all schema for all templated policy that don't require a schema
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)
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// ACLTemplatedPolicyBase contains basic information about builtin templated policies
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// template name, id, template code and schema
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type ACLTemplatedPolicyBase struct {
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TemplateName string
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TemplateID string
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Schema string
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Template string
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}
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var (
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// Note: when adding a new builtin template, ensure you update `command/acl/templatedpolicy/formatter.go`
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// to handle the new templates required variables and schema.
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aclTemplatedPoliciesList = map[string]*ACLTemplatedPolicyBase{
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api.ACLTemplatedPolicyServiceName: {
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TemplateID: ACLTemplatedPolicyServiceID,
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TemplateName: api.ACLTemplatedPolicyServiceName,
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Schema: ACLTemplatedPolicyServiceSchema,
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Template: ACLTemplatedPolicyService,
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},
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api.ACLTemplatedPolicyNodeName: {
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TemplateID: ACLTemplatedPolicyNodeID,
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TemplateName: api.ACLTemplatedPolicyNodeName,
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Schema: ACLTemplatedPolicyNodeSchema,
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Template: ACLTemplatedPolicyNode,
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},
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api.ACLTemplatedPolicyDNSName: {
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TemplateID: ACLTemplatedPolicyDNSID,
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TemplateName: api.ACLTemplatedPolicyDNSName,
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Schema: ACLTemplatedPolicyNoRequiredVariablesSchema,
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Template: ACLTemplatedPolicyDNS,
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},
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api.ACLTemplatedPolicyNomadServerName: {
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TemplateID: ACLTemplatedPolicyNomadServerID,
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TemplateName: api.ACLTemplatedPolicyNomadServerName,
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Schema: ACLTemplatedPolicyNoRequiredVariablesSchema,
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Template: ACLTemplatedPolicyNomadServer,
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},
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}
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)
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// ACLTemplatedPolicy represents a template used to generate a `synthetic` policy
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// given some input variables.
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type ACLTemplatedPolicy struct {
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// TemplateID are hidden from all displays and should not be exposed to the users.
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TemplateID string `json:",omitempty"`
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// TemplateName is used for display purposes mostly and should not be used for policy rendering.
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TemplateName string `json:",omitempty"`
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// TemplateVariables are input variables required to render templated policies.
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TemplateVariables *ACLTemplatedPolicyVariables `json:",omitempty"`
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// Datacenters that the synthetic policy will be valid within.
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// - No wildcards allowed
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// - If empty then the synthetic policy is valid within all datacenters
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//
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// This is kept for legacy reasons to enable us to replace Node/Service Identities by templated policies.
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//
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// Only valid for global tokens. It is an error to specify this for local tokens.
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Datacenters []string `json:",omitempty"`
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}
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// ACLTemplatedPolicyVariables are input variables required to render templated policies.
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type ACLTemplatedPolicyVariables struct {
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Name string `json:"name,omitempty"`
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}
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func (tp *ACLTemplatedPolicy) Clone() *ACLTemplatedPolicy {
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tp2 := *tp
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tp2.TemplateVariables = nil
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if tp.TemplateVariables != nil {
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tp2.TemplateVariables = tp.TemplateVariables.Clone()
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}
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tp2.Datacenters = stringslice.CloneStringSlice(tp.Datacenters)
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return &tp2
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}
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func (tp *ACLTemplatedPolicy) AddToHash(h hash.Hash) {
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h.Write([]byte(tp.TemplateID))
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h.Write([]byte(tp.TemplateName))
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if tp.TemplateVariables != nil {
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tp.TemplateVariables.AddToHash(h)
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}
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for _, dc := range tp.Datacenters {
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h.Write([]byte(dc))
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}
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}
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func (tv *ACLTemplatedPolicyVariables) AddToHash(h hash.Hash) {
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h.Write([]byte(tv.Name))
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}
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func (tv *ACLTemplatedPolicyVariables) Clone() *ACLTemplatedPolicyVariables {
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tv2 := *tv
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return &tv2
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}
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// validates templated policy variables against schema.
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func (tp *ACLTemplatedPolicy) ValidateTemplatedPolicy(schema string) error {
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if schema == "" {
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return nil
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}
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loader := gojsonschema.NewStringLoader(schema)
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dataloader := gojsonschema.NewGoLoader(tp.TemplateVariables)
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res, err := gojsonschema.Validate(loader, dataloader)
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if err != nil {
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return fmt.Errorf("failed to load json schema for validation %w", err)
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}
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if res.Valid() {
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return nil
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}
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var merr *multierror.Error
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for _, resultError := range res.Errors() {
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merr = multierror.Append(merr, fmt.Errorf(resultError.Description()))
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}
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return merr.ErrorOrNil()
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}
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func (tp *ACLTemplatedPolicy) EstimateSize() int {
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size := len(tp.TemplateName) + len(tp.TemplateID) + tp.TemplateVariables.EstimateSize()
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for _, dc := range tp.Datacenters {
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size += len(dc)
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}
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return size
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}
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func (tv *ACLTemplatedPolicyVariables) EstimateSize() int {
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return len(tv.Name)
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}
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// SyntheticPolicy generates a policy based on templated policies' ID and variables
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//
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// Given that we validate this string name before persisting, we do not
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// have to escape it before doing the following interpolation.
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func (tp *ACLTemplatedPolicy) SyntheticPolicy(entMeta *acl.EnterpriseMeta) (*ACLPolicy, error) {
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rules, err := tp.aclTemplatedPolicyRules(entMeta)
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if err != nil {
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return nil, err
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}
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hasher := fnv.New128a()
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hashID := fmt.Sprintf("%x", hasher.Sum([]byte(rules)))
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policy := &ACLPolicy{
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Rules: rules,
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ID: hashID,
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Name: fmt.Sprintf("synthetic-policy-%s", hashID),
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Datacenters: tp.Datacenters,
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Description: fmt.Sprintf("synthetic policy generated from templated policy: %s", tp.TemplateName),
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}
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policy.EnterpriseMeta.Merge(entMeta)
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policy.SetHash(true)
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return policy, nil
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}
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func (tp *ACLTemplatedPolicy) aclTemplatedPolicyRules(entMeta *acl.EnterpriseMeta) (string, error) {
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if entMeta == nil {
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entMeta = DefaultEnterpriseMetaInDefaultPartition()
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}
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entMeta.Normalize()
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tpl := template.New(tp.TemplateName)
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tmplCode, ok := aclTemplatedPoliciesList[tp.TemplateName]
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if !ok {
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return "", fmt.Errorf("acl templated policy does not exist: %s", tp.TemplateName)
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}
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parsedTpl, err := tpl.Parse(tmplCode.Template)
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if err != nil {
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return "", fmt.Errorf("an error occured when parsing template structs: %w", err)
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}
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var buf bytes.Buffer
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err = parsedTpl.Execute(&buf, struct {
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*ACLTemplatedPolicyVariables
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Namespace string
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Partition string
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}{
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Namespace: entMeta.NamespaceOrDefault(),
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Partition: entMeta.PartitionOrDefault(),
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ACLTemplatedPolicyVariables: tp.TemplateVariables,
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})
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if err != nil {
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return "", fmt.Errorf("an error occured when executing on templated policy variables: %w", err)
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}
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return buf.String(), nil
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}
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// Deduplicate returns a new list of templated policies without duplicates.
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// compares values of template variables to ensure no duplicates
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func (tps ACLTemplatedPolicies) Deduplicate() ACLTemplatedPolicies {
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list := make(map[string][]ACLTemplatedPolicyVariables)
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var out ACLTemplatedPolicies
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for _, tp := range tps {
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// checks if template name already in the unique list
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_, found := list[tp.TemplateName]
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if !found {
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list[tp.TemplateName] = make([]ACLTemplatedPolicyVariables, 0)
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}
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templateSchema := aclTemplatedPoliciesList[tp.TemplateName].Schema
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// if schema is empty, template does not require variables
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if templateSchema == "" {
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if !found {
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out = append(out, tp)
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}
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continue
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}
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if !slices.Contains(list[tp.TemplateName], *tp.TemplateVariables) {
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list[tp.TemplateName] = append(list[tp.TemplateName], *tp.TemplateVariables)
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out = append(out, tp)
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}
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}
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return out
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}
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func GetACLTemplatedPolicyBase(templateName string) (*ACLTemplatedPolicyBase, bool) {
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if orig, found := aclTemplatedPoliciesList[templateName]; found {
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copy := *orig
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return ©, found
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}
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return nil, false
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}
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// GetACLTemplatedPolicyList returns a copy of the list of templated policies
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func GetACLTemplatedPolicyList() map[string]*ACLTemplatedPolicyBase {
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m := make(map[string]*ACLTemplatedPolicyBase, len(aclTemplatedPoliciesList))
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for k, v := range aclTemplatedPoliciesList {
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m[k] = v
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}
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return m
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}
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